fftw_threads_test.c

FFTW, a collection of fast C routines to compute the Discrete Fourier Transform in one or more dime

		     "input has been overwritten");

     for (i = 0; i < howmany; ++i) {
	  fftw(validated_plan, 1, in2 + n * i, 1, n, out2 + n * i, 1, n);
     }

     CHECK(compute_error_complex(in1, istride, out2, 1, n * howmany) < TOLERANCE,
	   "test_in_place: wrong answer");
     WHEN_VERBOSE(2, printf("OK\n"));

     fftw_free(in1);
     fftw_free(in2);
     fftw_free(out2);
}

void test_out_of_place_both(int n, int istride, int ostride,
			    int howmany,
			    fftw_plan validated_plan_forward,
			    fftw_plan validated_plan_backward)
{
     int specific;

     for (specific = 0; specific <= 1; ++specific) {
	  WHEN_VERBOSE(2,
	       printf("TEST CORRECTNESS (out of place, FFTW_FORWARD, %s)"
		   " n = %d  istride = %d  ostride = %d  howmany = %d\n",
		      SPECIFICP(specific),
		      n, istride, ostride, howmany));
	  test_out_of_place(n, istride, ostride, howmany, FFTW_FORWARD,
			    validated_plan_forward, specific);

	  WHEN_VERBOSE(2,
	      printf("TEST CORRECTNESS (out of place, FFTW_BACKWARD, %s)"
		   " n = %d  istride = %d  ostride = %d  howmany = %d\n",
		     SPECIFICP(specific),
		     n, istride, ostride, howmany));
	  test_out_of_place(n, istride, ostride, howmany, FFTW_BACKWARD,
			    validated_plan_backward, specific);
     }
}

void test_in_place_both(int n, int istride, int howmany,
			fftw_plan validated_plan_forward,
			fftw_plan validated_plan_backward)
{
     int specific;

     for (specific = 0; specific <= 1; ++specific) {
	  WHEN_VERBOSE(2,
		  printf("TEST CORRECTNESS (in place, FFTW_FORWARD, %s) "
			 "n = %d  istride = %d  howmany = %d\n",
			 SPECIFICP(specific),
			 n, istride, howmany));
	  test_in_place(n, istride, howmany, FFTW_FORWARD,
			validated_plan_forward, specific);

	  WHEN_VERBOSE(2,
		 printf("TEST CORRECTNESS (in place, FFTW_BACKWARD, %s) "
			"n = %d  istride = %d  howmany = %d\n",
			SPECIFICP(specific),
			n, istride, howmany));
	  test_in_place(n, istride, howmany, FFTW_BACKWARD,
			validated_plan_backward, specific);
     }
}

void test_correctness(int n)
{
     int istride, ostride, howmany;
     fftw_plan validated_plan_forward, validated_plan_backward;

     WHEN_VERBOSE(1,
		  printf("Testing correctness for n = %d...", n);
		  fflush(stdout));

     /* produce a good plan */
     validated_plan_forward =
	 fftw_create_plan(n, FFTW_FORWARD, measure_flag | wisdom_flag);
     validated_plan_backward =
	 fftw_create_plan(n, FFTW_BACKWARD, measure_flag | wisdom_flag);

     for (istride = 1; istride <= MAX_STRIDE; ++istride)
	  for (ostride = 1; ostride <= MAX_STRIDE; ++ostride)
	       for (howmany = 1; howmany <= MAX_HOWMANY; ++howmany)
		    test_out_of_place_both(n, istride, ostride, howmany,
					   validated_plan_forward,
					   validated_plan_backward);

     for (istride = 1; istride <= MAX_STRIDE; ++istride)
	  for (howmany = 1; howmany <= MAX_HOWMANY; ++howmany)
	       test_in_place_both(n, istride, howmany,
				  validated_plan_forward,
				  validated_plan_backward);

     fftw_destroy_plan(validated_plan_forward);
     fftw_destroy_plan(validated_plan_backward);

     if (!(wisdom_flag & FFTW_USE_WISDOM) && chk_mem_leak)
	  fftw_check_memory_leaks();

     WHEN_VERBOSE(1, printf("OK\n"));
}

/*************************************************
 * multi-dimensional correctness tests
 *************************************************/

void testnd_out_of_place(int rank, int *n, fftw_direction dir,
			 fftwnd_plan validated_plan)
{
     int istride, ostride;
     int N, dim, i;
     fftw_complex *in1, *in2, *out1, *out2;
     fftwnd_plan p;
     int flags = measure_flag | wisdom_flag;

     if (coinflip())
	  flags |= FFTW_THREADSAFE;

     N = 1;
     for (dim = 0; dim < rank; ++dim)
	  N *= n[dim];

     in1 = (fftw_complex *) fftw_malloc(N * MAX_STRIDE * sizeof(fftw_complex));
     out1 = (fftw_complex *) fftw_malloc(N * MAX_STRIDE * sizeof(fftw_complex));
     in2 = (fftw_complex *) fftw_malloc(N * sizeof(fftw_complex));
     out2 = (fftw_complex *) fftw_malloc(N * sizeof(fftw_complex));

     p = fftwnd_create_plan(rank, n, dir, flags);

     for (istride = 1; istride <= MAX_STRIDE; ++istride) {
	  /* generate random inputs */
	  for (i = 0; i < N; ++i) {
	       int j;
	       c_re(in2[i]) = DRAND();
	       c_im(in2[i]) = DRAND();
	       for (j = 0; j < istride; ++j) {
		    c_re(in1[i * istride + j]) = c_re(in2[i]);
		    c_im(in1[i * istride + j]) = c_im(in2[i]);
	       }
	  }

	  for (ostride = 1; ostride <= MAX_STRIDE; ++ostride) {
	       int howmany = (istride < ostride) ? istride : ostride;

	       if (howmany != 1 || istride != 1 || ostride != 1 || coinflip())
		    fftwnd_threads(nthreads, p, howmany, in1, istride, 1,
				   out1, ostride, 1);
	       else
		    fftwnd_threads_one(nthreads, p, in1, out1);

	       fftwnd(validated_plan, 1, in2, 1, 1, out2, 1, 1);

	       for (i = 0; i < howmany; ++i)
		    CHECK(compute_error_complex(out1 + i, ostride, out2, 1, N)
			  < TOLERANCE,
			  "testnd_out_of_place: wrong answer");
	  }
     }

     fftwnd_destroy_plan(p);

     fftw_free(out2);
     fftw_free(in2);
     fftw_free(out1);
     fftw_free(in1);
}

void testnd_in_place(int rank, int *n, fftw_direction dir,
		     fftwnd_plan validated_plan,
		     int alternate_api, int specific, int force_buffered)
{
     int istride;
     int N, dim, i;
     fftw_complex *in1, *in2, *out2;
     fftwnd_plan p;
     int flags = measure_flag | wisdom_flag | FFTW_IN_PLACE;

     if (coinflip())
	  flags |= FFTW_THREADSAFE;

     if (force_buffered)
	  flags |= FFTWND_FORCE_BUFFERED;

     N = 1;
     for (dim = 0; dim < rank; ++dim)
	  N *= n[dim];

     in1 = (fftw_complex *) fftw_malloc(N * MAX_STRIDE * sizeof(fftw_complex));
     in2 = (fftw_complex *) fftw_malloc(N * sizeof(fftw_complex));
     out2 = (fftw_complex *) fftw_malloc(N * sizeof(fftw_complex));

     if (!specific) {
	  if (alternate_api && (rank == 2 || rank == 3)) {
	       if (rank == 2)
		    p = fftw2d_create_plan(n[0], n[1], dir, flags);
	       else
		    p = fftw3d_create_plan(n[0], n[1], n[2], dir, flags);
	  } else		/* standard api */
	       p = fftwnd_create_plan(rank, n, dir, flags);
     } else {			/* specific plan creation */
	  if (alternate_api && (rank == 2 || rank == 3)) {
	       if (rank == 2)
		    p = fftw2d_create_plan_specific(n[0], n[1], dir, flags,
						    in1, 1,
					       (fftw_complex *) NULL, 1);
	       else
		    p = fftw3d_create_plan_specific(n[0], n[1], n[2], dir, flags,
						    in1, 1,
					       (fftw_complex *) NULL, 1);
	  } else		/* standard api */
	       p = fftwnd_create_plan_specific(rank, n, dir, flags,
					       in1, 1,
					       (fftw_complex *) NULL, 1);

     }

     for (istride = 1; istride <= MAX_STRIDE; ++istride) {
	  /* 
	   * generate random inputs */
	  for (i = 0; i < N; ++i) {
	       int j;
	       c_re(in2[i]) = DRAND();
	       c_im(in2[i]) = DRAND();
	       for (j = 0; j < istride; ++j) {
		    c_re(in1[i * istride + j]) = c_re(in2[i]);
		    c_im(in1[i * istride + j]) = c_im(in2[i]);
	       }
	  }

	  if (istride != 1 || istride != 1 || coinflip())
	       fftwnd_threads(nthreads, p, istride, in1, istride, 1,
			      (fftw_complex *) NULL, 1, 1);
	  else
	       fftwnd_threads_one(nthreads, p, in1, NULL);

	  fftwnd(validated_plan, 1, in2, 1, 1, out2, 1, 1);

	  for (i = 0; i < istride; ++i)
	       CHECK(compute_error_complex(in1 + i, istride, out2, 1, N) < TOLERANCE,
		     "testnd_in_place: wrong answer");
     }

     fftwnd_destroy_plan(p);

     fftw_free(out2);
     fftw_free(in2);
     fftw_free(in1);
}

void testnd_correctness(struct size sz, fftw_direction dir,
			int alt_api, int specific, int force_buf)
{
     fftwnd_plan validated_plan;

     validated_plan = fftwnd_create_plan(sz.rank, sz.narray,
					 dir, measure_flag | wisdom_flag);

     testnd_out_of_place(sz.rank, sz.narray, dir, validated_plan);
     testnd_in_place(sz.rank, sz.narray, dir, validated_plan, alt_api, specific, force_buf);

     fftwnd_destroy_plan(validated_plan);
}

/*************************************************
 * planner tests
 *************************************************/

void test_planner(int rank)
{
     WHEN_VERBOSE(1, printf("Use fftw_test to test the planner.\n"););
}

/*************************************************
 * test initialization
 *************************************************/

void test_init(int *argc, char ***argv)
{
     int i;

     if (*argc >= 2)
	  nthreads = atoi((*argv)[1]);

     if (nthreads <= 0) {
	  fprintf(stderr, "Usage: fftw_threads_test <nthreads> [ options ]\n");
	  exit(EXIT_FAILURE);
     }
     for (i = 2; i < *argc; ++i)
	  (*argv)[i - 1] = (*argv)[i];
     *argc -= 1;

     if (fftw_threads_init()) {
	  fprintf(stderr, "Error initializing threads!\n");
	  exit(EXIT_FAILURE);
     }
}

void test_finish(void)
{
}

void enter_paranoid_mode(void)
{
}

int get_option(int argc, char **argv, char *argval, int argval_maxlen)
{
     return default_get_option(argc,argv,argval,argval_maxlen);
}